Question
A solution containing components $$A$$ and $$B$$ follows Raoult’s law, when
A.
$$A- B$$ attraction force is greater than $$A- A$$ and $$B-B$$
B.
$$A-B$$ attraction force is less than $$A - A$$ and $$B-B$$
C.
$$A -B$$ attraction force remains same as $$A - A$$ and $$B-B$$
D.
volurne of solution is different from sum of volumes of solute and solvent
Answer :
$$A -B$$ attraction force remains same as $$A - A$$ and $$B-B$$
Solution :
Raoult’s law is valid for ideal solution only. The two components $$A$$ and $$B$$ follows the condition of Raoult’s law only when the force of attraction between $$A$$ and $$B$$ is equal to the force of attraction between $$A-A$$ and $$B-B.$$
While non-ideal solutions exhibit either positive or negative deviations from Raoult’s law. When $$A - B$$ attraction force is greater than $$A-A$$ and $$B-B,$$ then solution shows negative deviation and when $$A-B$$ attraction force is less than $$A-A$$ and $$B-B,$$ the solution shows positive deviation.